During WWII, not only did posters continue to play their important role as vectors of motivation and patriotic fervor. They also appealed "to darker emotions such as anger at the human cost of war. The appeal of posters also lies in the use of familiar images and expressions. Graphic artists combined their skill with advertising copywriters to sway public opinion and unite people in support of the war effort. The posters’ effectiveness arises from complex designs of words and symbols to communicate, invite action and build consensus." (Source: Australian National Wartime Museum, Patriotism, Persuasion, Propaganda, American War Posters).